Henry b



(No Model.)

H. B. HUNT.

COMPASS UORREOTOR.-

No. 891,534. Patented Oct. 23, 1888.

N. PETERS, Phato-Lilhngnplmr, Washingln. u c.

UNITED STATES arena ilrricm HENRY B. HUNT, OF NEYV YORK, N. Y.

COMPASS CORRECTOR.

SPECIFICATION forming part of Letters Patent No. 391,534, dated October 23, 1888.

Application filed January 26, 1888. Serial No. 261,958. (No model.)

To all whom it may concern:

Be it known that I, HENRY B. HUNT, of the city and county of New York, in the State of New York, have invented a new and useful Improvement in Means of Compensation for Deviation of Ships Compasses, of which the following is a specification.

My invention, which is adapted for both liquid and card compasses, may be applied with but very little change and expense to any binnacle now in use.

The most modern method of compensating for compass deviation has been to arrange the soft-iron correctors and the magnets, which respectively compensate for quadrantal and semicircular deviations, upon the binnacle; but, although this is a great improvement over the older method, as it dispenses with the large and unsightly magnets on deck, it is still far from perfect, because the relation of the correctors and magnets to the needle is constantly changing by the heeling and pitching motions of the vessel.

The object of my invention is to so arrange the correctors and magnets that, notwithstanding the heeling and pitching motions of the vessel, their relation to the bowl and needle will remain unchanged, and to this end I arrange the correctors and magnets both upon the bowl of the compass.

,, The invention will be hereinafter described and pointed out in the claims.

In the accompanying drawings, Figure 1 is a partly sectional elevation of a binnacle and a compass embodying my invention. Fig. 2 is a horizontal section on the plane of the dotted line as :0, Fig.1. Fig. 3 represents one of the soft-iron correctors detached from other parts. Fig.4 represents one of the magnets employed, and Fig. 5 represents detached from each other the several parts whereby each magnet is adjustably secured in place upon the bowl.

Similar letters of reference designate corresponding parts in all the figures.

A designates the lower part of the binnacle, wherein the compass-bowl B is supported,and A is thehood or upper part of the binnacle. The bowl Bis, as usual, supported in gimballs, 0 being the gimball-ring, which is supported on joints or trunnions c in the binnacle A,

and in which the bowl is supported by pivots or trunnions c. i

D designates the soft-iron correctors, which are used to compensate for quadrantal deviation, and E designates the magnets, which serve to compensate for semicircular deviation. According to my invention the correctors and magnets are carried by the bowl, and hence their relation to the needle never changes, save by adjustment, and is not affected by the hecling and pitching motions of the vessel.

In order to provide for the convenient sup port of the correctors I) and magnets E from the bowl B,'l may fit upon the bowl a circular band or ring, F, which may be secured thereon by set-screws s or otherwise, and from this band or ring project laterally lugs or cars f, which support the correctors and project downwardly, and arms or bracketsf, which carry the magnets E. The correctors D each consist of a bar or elongated piece ofsoft iron,provided, as here shown, with a downwardly-projecting shank or arm, d, which is received in the slot f in a lug or car, f, and there secured by a nut, d. The slotsf in the lugs or earsfprovide for the adjustment of the correctors toward or away from the bowl B. Although the earsf and the armsf are upon the hoop or ring F, they may be fairly considered as projecting from the bowl. Each arm or bracket f is formed with a slot, f, and the magnet is adjustable upward and downward thereon. As here shown, each magnet is secured to its arm or bracket by a clamp, (shown in Fig. 5,) and which consists of a block, 6, fitting the slotf and having a shoulder, c, which bears against one face of the arm or bracket f, while the magnet, having ahole, e, to receive said block, fits against the other face of the arm f. A washer or washers, e slips over the square end ofthe block 6 and bears against the magnet, and a screw, 6 enters the end of the block e and secures the parts of the clamp upon the arm or bracket f. By loosening any one of the clamps any one of the magnets may be adjusted up or down and thus caused to exert a more or less powerful influence on the needle.

By my invention I enable a compass to be adjusted or to have its deviations compensated for by the smallest possible correctors and KOO magnets, as they retain a uniform relation to the needle, unaffected by the heeling and pitching motions of the vessel. Any correction necessary to be made through any change in the Vessels polarity can be readily done by the master.

By my invention I provide a very simple arrangement and construction of devices, whereby the deviations of the compass resulting in iron ships from the quadrantal semicircular and heeling errors may be compensated for.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination,with the bowl of a compass, of soft-iron correctors and magnets, both of which are arranged upon the bowl, so that their relation to the needle remains unchanged, notwithstanding the heeling and pitching motions of the vessel, and both of which are adjustable relatively to the bowl, substantially as herein described.

2. The combination, with a compass-bowl and laterally-projecting lugs or ears extending beyond the sides thereof, of the soft-iron correctors D, adjustable in said lugs or cars toward and from the bowl, substantially as herein described.

3. The combination, with a compass-bowl and arms or brackets f, extending downward therefrom, of magnets E, secured to the arms or brackets and adj ustable upward and downward on them toward and from the bowl,substantially as herein described.

4. The combination, with a compass-bowl, of a hoop or ring encircling and secured on the bowl and having the lateral earsfand the downwardly-extending arms f, and the correctors D and magnets E, secured,respectively, on the ears and arms, substantially as herein described.

HENRY B. HUN '1.

'Witnesses:

O. HALL, FREDK. HAYNES. 

